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I don't think guiness have a 7 day record listed, however I did find this which suggests that the treadmill record is 403 miles
no listing on the GWR website for a Bernie Hollywood, though if you google his name only results put up by him are listed. I did however find this newspaper article which states;
having run 358 miles from John O’Groats to Carlisle in a week on his way to Land’s End
so he may have been at one point but has been overtaken quite dramatically since
I've always wondered this about Guinness world records, if you break one are you then always a record holder or is it like athletics where if you're overtaken it doesn't count any more (beyond being a "former record holder") as otherwise he's claiming something he no longer has, and that's unbecoming for a Officer of the Most Excellent Order of the British Empire
This mentioned 843km on a treadmill
in a week